Synthesis Of Fluorinated Copolymer And Its Application In Epoxy Coating

A hydrophobic copolymer P(FA-co-GMA-co-St) was prepared by Free radicals emulsion polymerization and the effects of monomer feed ratio on the copolymer was studied.The hydrophobic epoxy coating was prepared by blending copolymers. Five different types of epoxy resin was modified and find that the hydrophobicity of all the coatings was significantly enhanced. Contact angle of modified epoxy coating was increased from64°to 131°and surface energy dropped from 52.6mN.m-1 to 10.2mN.m-1. Water absorption of the coating was 2.7% before modified and dropped to 1.2% after modified by the copolymer.The surface reconstruction of modified epoxy coating in the wet condition was also studied. The result showed that contact angle of non-epoxy fluorinated copolymers modified coating sharply decreased by 48°to 88°after 48h exposure in water and the surface fluorine element reduced by 7.94%. The contact angle of epoxy fluorinated copolymer modified coating decreased by 15°to 116°after 48h exposure in water and the surface fluorine element reduced by 5.36%. The environmental stability of super-hydrophobic epoxy coatings was improved by epoxy copolymer.A series of corrosion resistance tests of modified epoxy coating showed that corrosion resistance and hydrophobicity of the coating were improved without depressing the mechanical properties. The surface energy and water absorption rate was reduced by mixing copolymer and the corrosion resistance can be greatly improved when the copolymer was added.